.~ Including evacuating, degasifying or getter or fluent material introduction {4}
55
.~.~ By gettering
DEFINITION
Classification: 445/55
By gettering:
(under subclass 53) Method introducing a chemical material such as a solid or vapor to absorb, adsorb or chemically tie up undesired material such as gases within the sealed enclosure of the lamp or device.
(1) Note. Gettering includes using materials which, when placed in the envelope, reduce the gas or vapor pressure in any manner, even though the theory of operation is not known. Gettering, therefore, includes using a reactive material which will chemically combine with the gas or vapor to form a nonvolatile compound, or to form a compound of lower vapor pressure or ionic activity. One gas may be a getter for another gas. Gettering also includes using materials, such as charcoal which adsorb and absorb the gases or vapors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9+, for methods of gettering which include generating a gas or vapor from a normally nongaseous and nonvaporous material in the envelope, the generated gas or vapor being active as a getter. Flashing magnesium is in subclasses 9+.
41, for similar subject matter which include an assembly or disassembly operation.
SEE OR SEARCH CLASS
252, Compositions, for miscellaneous chemical compositions, note especially
181.1+, for getter compositions. Note also subclasses 182.11+ for chemical agents or materials.
313, Electric Lamp and Discharge Devices,
549+, for electric lamps and electric space discharge devices which are provided with a getter. Class 313 provided for such devices with a getter whether claimed prior to the use of the getter (incompletely manufactured) or subsequent to such use.
417, Pumps,
48+, for electrical or getter type devices.
420, Alloys or Metallic Compositions, appropriate subclasses for metal powder products which are alloys.
423, Chemistry of Inorganic Compounds, appropriate subclasses, for inorganic compounds and nonmetallic elements which may be useful in gettering. Also note
210+, for modifying or removing component of normally gaseous material.
502, Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making, for a composition comprising a catalyst or support therefor or sorbent of general utility.
